tools: epson2usb: always use 4 digits for USB IDs

Otherwise the sorting is too confusing when 3- and 4-digits are mixed.

tools/epson2usb.pl

@@ -42,11 +42,8 @@ use warnings;
 		next unless $m->{'usbid'} =~ /"0x04b8"\s+"(0x[[:xdigit:]]+)"/;
 
 		my $id = $1;
-
 #		print $id, "\n";
 
-		$id =~ s/0x0/0x/;
-
 		$m->{'model'} =~ s/;.+$//;
 		$m->{'model'} =~ s/\"//g;
 		$m->{'model'} =~ s/\s+$//;